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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b9c3c2d8cd8f25c17ef35c00abb7831347efaf895ce71589572340d98c926d' 
  AND token = 'QK8cBqyl++iXASVAqwLn3UWgg8VqLKGccMQVf8JN15Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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