SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044754ac12cc7b2f832b7e757160e54eb43a8317d5b2727d9edba34c68c70a5e' 
  AND token = 'PvJH9sgoF2zlus2Gxh7CXFu+SPVcS5wVTAYDBd/K9Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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