SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a42d196ae888fe116c8507a43fe0cc078573b27c788e6953902c7ea5fdd2690' 
  AND token = 'DKVXi+9gNGevqJSCJxK9nOcKHm7vjtTB0OOYG5sODiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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