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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ed9e7c480ae4f2dee90e671b211408e9545d030b061b7f93c6462f22b8387c' 
  AND token = '2FPQ2v6oJ8dDbQr4rNs9sZ50RqtYvpem7Pg3d55r7ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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