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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8558e5e05a18ae12af756d7f25454d76edf7cef78da4d3aa8a9df17f365d0d' 
  AND token = 't2ZI3bstqPJ8sXhAALwFbWNtdOw/1Va3kaJW/0OGBFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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