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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff7843e4680e4ee78281cbc32adb061920d9c72304c89ec8d4249e9a46f44f3' 
  AND token = 'loyXsSfHpi06PI48ueHbVKQ9bl2bVyYVh391j2xqLug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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