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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dda8fa6996914feda91e671ae677339ba9956947f8b196ae71f7b5d8a8ecf1' 
  AND token = '9NSIq6QldEle75FK5UZNXN/6E8DpVD6eTDJc/ECQoYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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