SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411cdbba8e4b008cf6453f519ab8534c51d897e3643eb7af32dad009e4bf2e06' 
  AND token = 'ptoJjAb8agZNGtBJSOLWPGeP1rfV/BFbUighGhRAYqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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