SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df280d34e48b4bafe618aab0e7bb71dbf02dba30471945351953d975553ff2b0' 
  AND token = 'ITsAHNDwOBerSgGnrlMTHREKL6qo/6hYYVn1TviimU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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