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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e6541f242471f3b8d3f97fa755551909c8e95e4b73cff2b0d9c7033c86e8c0' 
  AND token = 'DOenl6g6YfMHFb3CpHbQe4Juk3alXrTMgkWznUo7aGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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