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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76e77f31a4fa9f1247293060b656cfb8ad3a31b17231e51b7d43e10a84be0ef' 
  AND token = 'XN8WxeJ7UbQFqdqUE21dZV41frE4bMXeE7bKSFkTXBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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