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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc51325ec35a4fd890dee873c7cfecc396fa631556bcb954f4990db1c15a2f5' 
  AND token = 'vtcTEOF/jmt6Ci4JJ9GpN5I9K8fI7Ata12QxnXXshvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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