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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b93f04845c9bdb8881ec7dce04f86f150bb9dd4d51c84ecf04b81c2e8b08708' 
  AND token = 'N1oKKecg4wED7siF++dQhIrMAHpOQ1Our+AIYnI9m6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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