SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd77ff28ed0c16a434f180c752ffc1d556a8f75479381cdc538e5aa506ef2a6b' 
  AND token = 'TfIPC/Ckwm7qHMJwtfM2JjeC2HvuQ9EvChCXgq9ZbUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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