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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad4f8d4f131656a284537213f18cb734a28812db340b06cacc139fe9bca2250' 
  AND token = 'KRsuM0HiWa3IVDZ2dAE8AJpnaEMdbmeDWTPlYpF7A40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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