SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d8ed8877cf5d1fd33cdc37480112087d87b4d3c962a1c7da5fbf51baa763ff' 
  AND token = 'ayeYGQw7LEabytMgFglzrhgAUCp+v/hb9tsxodPqUZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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