Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf45579c622f49f705668931a5082df2e37b37c29c21d007d129c18eacbe76b' 
  AND token = '872681BHNG2uxnsbQDGxsMjpxzp6VMnOgTBLkLPphFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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