SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f834a4a6c8846088f23a23af4c1dc5304597b12d8356de663b52abb80a530d' 
  AND token = 'mITRIfbZRz63hBjnO7HJcqp+mK1D1Wjw0fV/rg4vrTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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