SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c64a9a71488681018fd8d9522b76e7d1be326393637351034f001a40829210' 
  AND token = 'QU+dS2VghjiBDGPNwziUe+Bs3KnHhEs3RpX27qqDU2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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