SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a38add48abf731e652ff54f8418880131a8a5bd76cce06f9e600e6a3d23032f' 
  AND token = 'gJ74KjIvdmWk2yDcAXU73B6bhCF16CiOlSGgNvIVHYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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