SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aa58a8ac2d7775c58c28049136255ff384eebc588ced2ac51d313b3b5e97f3' 
  AND token = 'ZjwBJkw0HTITLK/rzmLgx2FjlXLoitYdhtJvgyw1w+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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