SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87014c93d603d883382f471ff48a3e52a1d915213613903e415ffbc4714923f6' 
  AND token = 'hEhvCS3IWPcrIq9KIZkmwjBMgAv/cDgr4rsz4wABj4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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