SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772c60b167dc06499104e20a13ad0c336916b3adfca38c2846b43b4ef2467ab4' 
  AND token = 'bwLx4W6fgH7tj+Oz/lGlUCL9/csAn/dYuxQXZVK3hIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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