Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3352a4a1a00be3280ff9670c09e69d4109d4fa7d7049b2936759d2dfd3fbe6' 
  AND token = 'wpYmsCIoxfw9uyuOAV9BAk81kTcL8ntNB4t4euvRWkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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