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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addf36f35951009c5bbc36fb7a754741c1d8168c24afee97f278ea01653d8d8f' 
  AND token = 'ZDzbRV9LCAwWwRFDYH4V0k8a2VkyaWnMFf5lqEpTB64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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