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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff359e7c4e688d5d05aa4706feae2c364b23b23ef7fb9c54cde067773e1d48f8' 
  AND token = 'pMv2koIujGw9pm1PlsG5cfj20Gczp101NQK2c1L7rAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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