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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854f03567bf992cc76f7fc940e84befe61c873a4f44abfa351142f271800079f' 
  AND token = '6wjTOwHdijjsvnCfNTFuE4WZQZ17ykchLhQrSKTLoDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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