Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f505829e8367900cd118501d6610ef7dbac5d1ecab22ce9dec6326c3b75f92' 
  AND token = '5RwTIrwRQirwU1bw4ybZ4jq2tzyfRM4qHHn0bjgEwZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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