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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9140cfa9d3de4c73b08fb9078670d26f075106fc89fe59b586373a0ad87c35' 
  AND token = '9kiA4AYbG/SW/Fjo+zQ4J8yA+S0nGeyXrjKQGfqD8wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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