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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a900227225a61c39c18fa2a32853a4dccf1103d0a1bd8beec3a467e09fd28534' 
  AND token = 'uhX9mMDmRjJ2YPyUb6VMACAQtQ4y7QtyvcGmmP/AzhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}