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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfee5a6e65f793a30e1ef661a574b644ddfe1877ab1bfd97e1a6b69bec7a167b' 
  AND token = 'ufbb6zHuH3QN9FwhRec5L61MLQeO/QQWEgB+eRCazSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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