SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01029360b14a72031f6f39a178b74a8e50cacbba65f812c0d17177519e3ea46' 
  AND token = 'qwZAHNEFWSRaOCsJsIKaWQ+RhnV7E2gFrDGO8gYPPLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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