SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a5f7189a7b5db113f2d380eae7532154c5580caf283849033c9e04a68ac24b' 
  AND token = 'O+OzgUbHppKU/YDfjUHNZ+okUNNwoPYvwi36bAzHXuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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