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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5569e7576ae1fc043b7139afa87d56df25d4f8ddfaee4c6ee493bf16c29de6' 
  AND token = 'O1afvPuyHl4P1qfM6Q+Di4MGgNRoEx+Sted1HoZBvzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}