SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dec0ca65cd0afc92598cb86e32ad4921fef56bff070425f9df4312cc317df2' 
  AND token = 'q3Z6l4jK+hAHCG6h+n378MRIWvlJxTryhvcgvf8TbK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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