SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a741bc89e81b59b667ca368d9d85534de9cc1e76460474f089004fc01fbafe30' 
  AND token = 'OYBUPjQyTcagjgKZF0HeIKx4PkxgUjiVx7Gwz9N3XNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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