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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b81d1a753ec2d2089fecdfe57a1ef07daa60e6eadbf414698b5ce8d2661bb4' 
  AND token = 'n4X4sjs3JcJCHlbwuZj4g46qnLcqVlDDlx/kFL9kRCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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