SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c2b658740b937b6d64f96f8d7e8834e1dc412b01b2e39b2257bc6cf12d3c4f' 
  AND token = 'wvgmShEKO0O06mkVT3T8BpYmAnaF8zINx/J4O/BSa30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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