SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d8888c97d8e567d1eea9994c2dba8d7b74a23d84fe45c2271af78976d766c9' 
  AND token = 'pUJh/Y/EvhIWGdxhLfF1GpqQfVOKT0KBFrcIovfhiM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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