SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00901c506caa8c87b1cb05e32419d21f3b056cf62502cf2d92b3e64541bb39fe' 
  AND token = 'mtCDJDujogXOs0YwsR8ZZhKlghA3nU9T4MwPMG/ZNXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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