SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdf001e8c609017b335a9687943b45c4c8b1bad66cb24fad938255a65d081d5' 
  AND token = 'm7xgCItVIpxfm3JiHY5M5XEJixcecG6+K+2gFwYKBTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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