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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf499a46fe29848db8b750eab4de8835484e814a20c7d9d568951a674826563' 
  AND token = '8VI1ByOc9wzxsTgb+41V6x1ZO2UgcjdkBfkkW8XHr7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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