SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd620e0424737929522fb6468e6089d8ada01e7dc7551860dcf933899f74e6e' 
  AND token = 'hZHFhj6GoWbmXgHagR81aOlDzSPNchu8QCVnav/wgw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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