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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2402c555e46b2ba4671528db2416dcbc3ba3f11b876e4e680cbba69fd4418b3b' 
  AND token = '0j9AZRz7J+2sehU56vIOA2MdiVezEbDkC/m87obIUqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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