SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca3f2d9e05df9b272927df8e4c32ac4591a7bcdc6afcbff7ff199cdc3c6487c' 
  AND token = 'VGa2sYHKWJzyLMgVJvzhKRu8rPgGhY9NFfQ/vPmuX0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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