SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9265cdf823a33c9ae9a4fa188956e429f3c57f30e1af50f03418a92acfa92f7' 
  AND token = 'vCqfKIWr87rZZ1jBqgGqWhadt38sXJVsaz/4ImG2kvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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