SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792774e63c7022fc5643ca307992bd59f5f57bae6630ccc85b6d357582308674' 
  AND token = 'IBrC04BVPs0fa+FO3DvL/2YmBnWQb/PfVvxhL6jh1Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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