SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162e2461be130e25799c1af759ed97e7db29b2c91d471d0e24c54d381b30732f' 
  AND token = 'BeszHopoVNLpnM85wqMDlL/OuvsOIgQq5Ap+0KZLI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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