Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf3229b7a5305a6a69bc2ccafc5e07522fc7e0c5c798a81b855dad84946939a' 
  AND token = 'tsTSUzCZlNjElFWlGEHd+iphrNCuj0M0TyTTVCqshrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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