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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47a39c4a836aa43aed1b375f8120b31ffbc908a19ae83fda0ed1f0bd3d35f54' 
  AND token = 'OK/wbXZTqw0hAJlWkq5q3QA9Jvkysdt6sMhyvpNKWTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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