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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c83809bcf9026fb82012c7e99902864e517cd1b1f8353c0716f3ff4bb8f93a9' 
  AND token = '17xHAqNk/3U3bggfsUBXSDM+eEZVBbhfyemvqz9I8Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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