SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b9fa57cae6ada5a8824bfd146fc907588bca9f6024fa11c48d838a3695b9d6' 
  AND token = 'ZsJbXGCVV5AlsPfKTrIO/VeqLyfxRTFATYOVkCfXKvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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