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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83030971089bb8467b62e1a2d44ec92869be8ac2eebf5e1efd94ccc876eb0584' 
  AND token = '/J1H9A11Z4XjjQBLfVRjhVMc++V2bxkY/kuxJ/FVEvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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