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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef5ef354e131382707765e097a9b7bdc89a4ebca4f8c799b95518c63b468f2f' 
  AND token = 'AiDUGIpsu+/Pe/VhKDbbRrA3+hMK5KGLWeBo6xhs8Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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