SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37815b5c0a49598cd9c7b5af147a6ec1dbe20600f4c8d3a6a7dde786106a551' 
  AND token = 'PkDgPgjO2VOfIWdpJa74/UFsCvdcCDlAmxGK+W3vTBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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