SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f82d5f363ef6548fb5cc605b953b3778b7b95829e4fb95a62f7e5769ec99654' 
  AND token = 'FyJvzV1wzRdzWJsc6cQXIFiCtODBAG8HqKWno1huVbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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