Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d61c9ea7da1560426e61d9d273c435e2bc9959f41b04a1c0855a4672647c2c' 
  AND token = 'y/GYqb5zjRVhe0M5jOMRtTH0KjtZf7G8mhAvPJ5MRXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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