SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5d69f695639f77ed25af7f14fe8639bb253e231bc49bf8646213df14a32749' 
  AND token = 'EbYKZ6iZ1LrxNcSF83zUCLUTlOQJr9UK9BmLPvHH3Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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