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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba4669b357b3517fd550e5353e4aec5a06e6796c0376b262ec57ba969e34151' 
  AND token = 'KAbj5pQf3CcfxlIUzk/INbqgAOFB9jr2hfGjbXiGv1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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