SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b41970c35d2092d732b58856ed0f86fb252503809cda6f3cfc77c5ac417890' 
  AND token = 'DWuxaknAHhxms5e0BwhzRQ+LTQQ/GtlVzmdpzX7S7Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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