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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1ab03df21c6aff3f3130cb1f7df817dcd9ac5b37ab2003f87c555219fb1601' 
  AND token = 'H7rH5bKl0/3XlVE8khQZabZXL9qdpN3JMCc0H9LG0mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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