SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0657d30afb614d180361be73d1f579f2275de8e77f53d6d810dc71c0bfc3db8d' 
  AND token = 'gqsEYxwBJjZOQkoa3pELLO8zJMBqZQ9GUMjRH9NdQuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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