SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb649fb60367474d078e845784409b3c1ac2e9483647794dc13e7b9c0c4be92' 
  AND token = 'odN26/qktbgGOGjjscYMzy3jhKBJwP5Z1sbgBDNKXeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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