Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51351168863913777470108a46eaa96c5a2baada17652001a54da6f43e5b2c98' 
  AND token = '72jVeDJkowqVwTE9MNEkRg6yOqeSt0yTvRK2YChpbF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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