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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c389fe97d1cb0153b95a04412e88105723f9ef85b38c0e4f8c2e61dc7cffdeb4' 
  AND token = 'go530zJO44TQ28VBZS3xiiivkf+jFVqeHfrmQOj15LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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