Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f47f4b24033097adf686f3433c29f47a314e02eefcbe1460aabb6c8016fb2c1' 
  AND token = 'LaI1N6YLwsbMp3T90YtvAq3MiVVSoHYx/BqaSH5pOcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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