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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28da4c49cafc4c41f47b934891fc5e033b7e98b9edacd11710e2488477ed851d' 
  AND token = 'DgFJBfxWGn0og2hd24pkdF0gNxXl4N+Dk7WnjrXyhnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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