SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb6fe8c122ae0663fc30ac4106d4710504a554d9517d209e3a166cef0ca6f01' 
  AND token = 'shuQKhI/gCLmLBvqQi0/ONLXipZyAJxrPSJLUagYQ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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