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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b726d412a2459c418181ed357ad5bf5caee40687e5c167d9cef43dd60a3fc7' 
  AND token = 'UWlxSDGkTdAS7F6MlC04W7aQ870CLNYhjCnuEJhNoUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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