SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99176671595275a33fe6bb493cc42fb828c6280488161c229874d0adaaf8dd' 
  AND token = '4LK/q+LtSqEmTfRqgoBkbplus78Q6anCvBObN30uqTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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