SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf40ea4953dcfa2a177a37ae8c4f461df7a1eb612759261043d120f7268dc9af' 
  AND token = 'bDsjoC+JDjvBM++FoXq2hWgrirVs5rbvM7QsLbEY2UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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