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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fa0bf7d33dc20ffb9e4dd8139b7d1ef018b4a544d7f188318ccded3ad325ba' 
  AND token = 'QRn/ugFWtzjzW9CTOvMVa4BIhNId+tph/8opT/bic64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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