SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3a8bc89b96c743242b8aa6d5a0bc56354eb66f7d817556fffd227c27b22a8c' 
  AND token = 'ITkHWWSyRNlSpf0hOgZCiJIO4IBpLT0WnzjwB7FqgvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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