SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131f518c8ab88d71bfe1316eea07dd8420f5a564ae9c4b3799ed268bfbcf5087' 
  AND token = 'K49gdq26B5jeAnCcrD918tGBrHId/6/oJ0VNZvJa+Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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