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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117b6c61b42dd9760747db5962980dc7fc8e434d4253c2b01900f32facfcb426' 
  AND token = '4GJkrkTo9qV8F7Ki55b7XGk7epTxBdD8AdfOCFwslyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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