SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba6064d07d2f08d476ed9081b7525782cb116893dca3d3751165a9d5b5b4eee' 
  AND token = 'EfYpaU0P4tt4hOG9wRjLmICVoJ1Js9teF+7vPGCZQsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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