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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c863d28f1c15cb7bd2cead41c4f37f7a23e8c847b88d605cc212f514449c28d' 
  AND token = 'rID/25btJj4PxgN06yPXCqjNkTgk7byJVzuxkVnyZJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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