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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9563754f7140f1e17f1290fa76dc0beac259c75c221fbd8fe9f53a7bb608aaea' 
  AND token = 'p8vggEcoIXn8/u9wArMkPQ939bz6cRAHKKvTo/fHAsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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