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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4e5455bb27e689c52933c9f57226d051bc53d35f8b062ecbb3618abd44e967' 
  AND token = 'bK/Y6CL6ZG/3zkMlOCP6NGK+u9pJbQKDzc+6LETsrA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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