SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2804836ffe04b5a80bd81f8377ce32346df9fa68b9d58b9a144127a3de2da9e' 
  AND token = '/Lfp6E5+m/uVBmBnS/Rn7IxAyF7ha6I84wKQrBz8hug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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