SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5e243c3dc044341a1c1bafc5932c30aa80676529928d03462bf844f6fceed1' 
  AND token = '8J5KHRyIAlQ+jAn+vbzS+FEK/YysHhgu+CZJGsHLh6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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