Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a2b3f71d9b481e4c612decb45482a1c5126d51d12016b79f99f89292eef73a' 
  AND token = 'j36fDOA4scrSGhf/kbQpxzNrHBAIUmx5hrqGYEK1mUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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