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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbb85eaa76269a205e5132ec266e4dd3f2c87f8afccaa9527aaaae7c5ec8da8' 
  AND token = '9LPTOu76t6ihPb3hd2xvPHNK0X7d83PPHUjZJ/ISasM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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