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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea61e0764d5fdd642f36d4af1b5c2e8b5adb72a69e8b29e49d150dce7346ba43' 
  AND token = '2TgIz+4ZTo41fVgX798tv5Bvfh1QjFJbNxK5vvj6Mcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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