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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03c769b6c78ecc6265f3a90cb33d563bf7ff96d747d4275fcef445fd6bd997b' 
  AND token = 'TolAKwkUKxCK7sy0byvSDMvqp8C6k6kmYmi2DT3jMXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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