Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0680b35a5b06545981eaa18ad336e610aef27dd29833d7f3d455d4eb907184' 
  AND token = 'lFBcxXGeu05tjA6NzLmvnd18ugK+cdx+tASZH7polDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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