SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1922ba747e5a9bceabde90dca3047862337cfdaced8f1f8c827be90a6e4ed48' 
  AND token = 'VhQBnBbFDzPrqPtGPkT0hBa4/+oRCL8Y7jzx5mw09YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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