Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296b77cc360728fa28d1121d038eb058bbbf26a4485322f100c72d8e582b7aea' 
  AND token = 'KzgcuVioZ035YLYPaKky9sfdD0p633EDyGZlR9y5zkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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