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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ad526e6d5ec35750320b5bd9e52dcf5d0959d3948a72e3df060a41090978ca' 
  AND token = '3SFiU7vEj5ZTkUDFSewvDqqvpW1GO1vKYXhtJ8vyzOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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