SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec93fbd6a96b1377359abd5c06e2273e4bdfb1c5be851699125ebedb85ea04a' 
  AND token = 'BNiZAbZTP+dgFJdshN4Kl6OPFVegvoQrjMB1CrmIWXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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