SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2345772786897a566b77e26495e5f68ac2a79b3b9ca45c11bd8e5ac4543899' 
  AND token = 'xoFCzPhwcK56+J+uNZkCn7Z5JfAWtDC3GXX1VMRrlTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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