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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fe4c856ab607ac9a9da2c87dca9be026aa372273c12fb37448684f1bc539bc' 
  AND token = '1/hvtjd+7LkD28kSeP7YY3c/7oJ1OqPP9Hh6mgKyOz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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