SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96a57dc839961b92dd8a7cb788d8030a8eaa14bd9acf2b78e8cb8fa2b3ecf4d' 
  AND token = '9wQLBq9SAXhKF/ff3ddYuAJvHT97pGqwCVH7+KvYgb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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