SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e235d359ad26b5a1a8a63c899cb8c6df03267afe412f048ff282157bb474ec' 
  AND token = 'QyoqgSKzj6yX2dSDmPnoWLEIFY4WHtaZbXcsVqvStrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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