SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e2c7de4679983e8066529a8c1e214eef3fbf74d2865d19a552f26dd9eb540e' 
  AND token = 'QsJCsZ/noEmn9zQh7Yguom4GsctBjtmravn4xjFxDhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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