SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4213f9174d1ede445fa477740d03183da7a33412c371e65d75210ec4a6ebe685' 
  AND token = 'kGGRF/+qG5DpDlw/gpnKg+w4VR9I4BVTcZVSjA2Lang=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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