SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e08fd6e2f1a9cb77d984456b1654bc31f69e93c94fc3a58e0141b6721e2c05' 
  AND token = 'AIXdj8eGpfTvnsMBJjKBGJbG+SPlCbIrqMgggSrYin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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