SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9854225c76587ef9a5716b792a4c5080b5b5ee76c574bf2b531639f996e9db' 
  AND token = 'L0pG2AOVTFTHBOhyWhYsl/CJd7DZH5Kuu/0jjLa9YZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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