SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a054470f4f593984de88ac1fccf6b7794f53d41502110ec8188c6a7befc6003' 
  AND token = 'lqqhP+0jU2Nd5t9glTHvRGVgsXI+F9GJwHXjlnj12gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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