SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becae3805b6fb14528fc0acbf1d6756fc339468ba54d28cc10079404dc3269a2' 
  AND token = 'hFfg7xxXHZ4XbLuvl5tMEP8BjyNwZLl+0UGYLAsRbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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