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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd8210f79c8576928ed8a7f973af21f4a9a96fc9320fe7c727e273de5ab37e7' 
  AND token = 'eoLTVa2IpKgj3C4UQob47zqtEYMrYE+GjQ9ADQx5yg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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