SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4653f040aa921053f674bfd02c9999bb9613f0548d6174f779aa97ffd7e5fc8' 
  AND token = 'I5/bUR2YocLuOQFFPh3WyyZIwSiPa/QvKQtKBD8QlEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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